重置FIREFOX到它的默认状态以加速FIREFOX

Reset Firefox to its default state

1. Click the menu button and then click help .
2. From the Help menu choose Troubleshooting Information.

   If you're unable to access the Help menu, type about:support in your address bar to bring up the Troubleshooting Information page.

3. Click the Reset Firefox… button in the upper-right corner of the Troubleshooting Information page.

   

4. To continue, click Reset Firefox in the confirmation window that opens.
5. Firefox will close and be reset. When it's done, a window will list the information that was imported. Click Finish and Firefox will open.

Note: There's also a Reset Firefox button in the Firefox Safe Mode window, if you can't start Firefox normally.

 

FROM  https://support.mozilla.org/en-US/kb/refresh-firefox-reset-add-ons-and-settings